noun
radial velocity; line-of-sight velocity
Astronomical term for the velocity of an object along the line of sight, measured via Doppler shift. Used in professional and educational contexts.
視線速度の測定から、その星が周期的に動いていることがわかった。
From measurements of radial velocity, it was found that the star moves periodically.
The radial velocity method is used to discover exoplanets.